GABRB3 – from febrile seizures to epileptic encephalopathies

Beta-3. Even though the gene for the beta-3 subunit of the GABA-A receptor (GABRB3) has not been mentioned frequently in the context of epilepsy genes, it is a gene that is frequently involved in genetic changed that give rise to epilepsy. Given that GABRB3 is one of the genes found within copy number changes on chromosome 15, it may predispose to human epilepsies through various genetic mechanisms including copy number variations and de novo mutations. In a recent publication in Neurology, we reviewed the phenotypes of patients with GABRB3 variants and found an unusual complexity of sporadic and familial cases. Here are three things that I have learned about GABRB3. Continue reading

Year 1 of the Epi25 Collaborative – the first 6,000 epilepsy exomes

At this time one year ago, the Epi25 Collaborative, a project of unprecedented scale, got the green light to start sending DNA to the Broad Institute for sequencing. More than 200 epilepsy researchers from nearly every epilepsy genetics project in the world sent 9,000 DNA samples to the Broad Institute for exome sequencing. Epi25 hopes to illuminate the complex nature of common epilepsies, ultra-rare variants, and bring more of the de novo mutations in encephalopathies into the “causative” group. Never before has such a massive collection of epilepsy samples been assembled so swiftly, truly from around the globe, with such grand aspirations. Continue reading